Fix deprecation warning in certain hist methods

Thanks @AndreasAlbert
Propagate renaming of 'project' function to plotting. #158

v0.6.8: Merge pull request #155 from lgray/spark_py27

Enable spark executor in python 2.7

v0.6.7

v0.6.7: unify rebin() and group() interfaces, new integrate() method …

v0.6.6

v0.6.6 : a number of fixes for JECs and btag scale-factors

v0.6.5: Merge pull request #144 from lgray/topic_fix143

Fallback to JME treatment of JEC files in case there are overlapping bins

v0.6.4

v0.6.4 : bug fix for clopper pearson calculator

v0.6.3

v0.6.3 parsl stability improvements & treename-per-file in fileset de…

v0.6.2

v0.6.2 fix interval hash, allows overlay of dense axes

v0.6.1

v0.6.1 - array accumulators and remove memmapped as default when runn…

v0.6.0

adapt to latest version of awkward array, prepare for uproot-methods …